437 589 16 43 00
Assembly tool
000 589 68 33 00
Internal extractor
000 589 35 33 00
Countersupport
406 589 04 15 00
Basic drift
Shown on front axle 737.221 |
1 | Inside area of axle tube on the locking side |
2 | Circumference of ring gear |
3 | Frontal area of drive pinion |
4 | Frontal area of axle tube on the locking side |
A | Dimension 1 |
B | Dimension 2 |
C | Overall height of large tapered roller bearing with outer race |
F | Dimension 3 |
G | Dimension 4 |
H | Dimension 5 |
K | Dimension 6 |
X | Constant dimension |
S1 | Shim thickness |
S2 | Shim thickness |
S3 | Shim thickness |
G33.30-3135-12
The shim thicknesses (S1, S2 and S3) are determined during the following steps. The tapered roller bearings must be replaced and the measurements conducted with extreme caution.
Otherwise the axle drive may be damaged.
Determine shim thickness (S1)
Note the following:
Dimension 1 (A) is entered at the plant. It is located on the inside area of the axle tube on locking side (1).
Dimension 2 (B) is entered at the plant. It is located on the circumference of the ring gear (2).
The constant dimension (X) for each pinion housing or differential housing is 83.51 mm.
1 | Measure overall height (C) of large tapered roller bearing with outer race (C) and note value. |
2 | Use the calculation formula to determine the shim thickness (S1) on the large tapered roller bearing. |
Calculation formula:
S1 = J (B + C)
J = A + X
J = ______ mm + 83.51 mm = ________ mm
B + C = ______ mm + ______ mm = _________ mm
S1 = ______ mm ______ mm = ____________ mm
S1 = __________ mm
Example calculation:
S1 = J (B + C)
J = A + X
J = 46.06 mm + 83.51 mm = 129.57 mm
B + C = 95.60 mm + 32.00 mm = 127.60 mm
S1 = 129.57 mm 127.60 mm = 1.97 mm
S1 = 1.97 mm
The dimensions specified in the calculation example (except constant dimension (X)) are standard dimensions. For adjustment use actual values only.
3 | In accordance with the determined dimension for the shim thickness (S1), insert shims into bearing seat on axle tube. |
4 | Install outer ring of large tapered roller bearing using basic drift and assembly tool. |
5 | Heat inner race of large tapered roller bearing on differential using hot plate to approx. 80 °C and install up to contact surface. |
Before starting the next adjustment operation, allow the inner race of the large tapered roller bearing to cool down. |
Determine shim thickness (S2)
Note the following:
Dimension 5 (H) is the dimension between the contact surface on the inner race of the small tapered roller bearing and the contact surface on the differential housing.
Dimension 5 (H) is the dimension between the contact surface on the inner race of the small tapered roller bearing and the contact surface on the differential housing.
The small tapered roller bearing must be installed with a bearing preload on the differential "I".
6 | Install outer ring of small tapered roller bearing without shim into long axle tube using basic drift and assembly tool. |
7 | Press inner race of small tapered roller bearing 2/3 of the way onto the bearing seat on the differential. |
The inner race of the small tapered roller bearing must not be installed up to the end stop on the bearing seat. |
8 | Insert differential in the axle tube with the locking device. |
9 | Mount long axle tube and fasten diagonally in place using 6 bolts. |
Turn ring gear continuously when tightening bolts. |
10 | Remove bolts and detach long axle tube. |
When disassembling do not adjust the position of the inner race. |
11 | Remove outer ring of small tapered roller bearing using counter stay and internal extractor from long axle tube. |
12 | Use feeler gauge to measure and note dimension 5 (H). |
When measuring do not adjust the position of the inner race. |
13 | Determine shim thickness (S2) by adding the noted dimension 5 (H) and the mean value of the specified bearing preload at the differential "I". |
See calculation formula. |
Calculation formula:
S2 = H + I
S2 = _____ mm + _____ mm = _____ mm
14 | In accordance with the determined dimension for the shim thickness (S2), insert shims into bearing seat on long axle tube. |
When selecting the shims, try to achieve the average value for the bearing preload on differential "I". |
15 | Install outer ring of small tapered roller bearing using basic drift and assembly tool into bearing seat of long axle tube. |
16 | Press inner race of small tapered roller bearing onto differential up to contact surface. |
Determine shim thickness (S3)
Note the following:
Dimension 4 (G) is entered at the factory. It is located on the end face of the drive pinion (3).
Dimension 6 (K) is entered at the factory. It is located on the end face of the axle tube on the differential side (4).
17 | Measure dimension 3 (F) from frontal area of drive pinion up to contact surface of pinion flange using a depth micrometer. |
18 | Use calculation formula to determine shim thickness (S3). |
Calculation formula:
S3 = (F + G) K
F + G = _____ mm + _____ mm = _____ mm
S3 = _____ mm _____ mm = _____ mm
S3 = _____ mm
Example calculation:
S3 = (F + G) K
F + G = 101.60 mm + 93.72 mm = 195.32 mm
S3 = 195.32 mm 192.73 mm = 2.59 mm
S3 = 2.59 mm
The dimensions cited in the calculation example are standard dimensions. For adjustment use actual values only.
19 | In accordance with determined dimension for shim thickness (S3) install shims between pinion flange and differential housing. |